Process for fillling joints and crevices in underburner coke oven brickwork



Feb'. 5; 1935.

lNVENTOR I BY w OTTO Filed Dec. 15, 1932 IN UNDERBURNER COKE OVEN BRICKWORK PROCESS FOR FILLING JOINTS AND GREVICES ATTORNEY Patented Feb. 5, 1935 I v UNITED STATES raoonss roa mmvc JOINTS AND o'anw ICES IN BBICKWOBK UNDERBUBNER COKE OVE Carl Otto, Essen, Germany Application December 15, 1932, Serial No. 847,418

" In Germany November 26, 1932 2Glaims.

Owing to the expansions, to which walls of gas and coke producingovens are subjected, crevices and untight joints areproduced at places, for instance, in the substructure of the oven, which are nearly inaccessible from the outside. Mortar guns or similar appliances, to which the liquid mortar is admitted by compressed air, are already in use for tightening damaged spots. But these apparatus have the drawback that it is difllcult on the one hand 'to put them into position and, on the other hand, to hit the crevice or the joint that has to be filled up with the mortar jet. It was further noted that by means oi. this process the untight joints were only superficially plastered with mortar and that considerable portions of mortar may collect on and adhere to the walls, thus causing troubles with respect to the gas streams.

The object of the invention is a process for tightening joints and crevices in the brickwork of underburner coke ovens, according to which the mortar is not injected by apparatus that have to be brought near the respective place, but is forced in from the outside. According to the inventionv a liquid mortar which is quick setting under the oven heat is forced upwards into the rich gas ducts of a regenerative coke oven of the underburner type in which rich gas is supplied from passageways underneath theoven, the ducts usually ascending in the regenerator walls and running vertically through the brickwork. The liquid mortar is allowed to remain a short time m these flues under pressure of the liquid column. By this process it is possible to thoroughly fill up the joints without requiring special devices that have to be exposed to heat.

The rich gas ducts which are not supplied .by gas during a working period, are connected to a vessel containing liquid mortar under a certain pressure. The pressure, under which the mortar is forced into each gas flue, is so proportioned as to correspond at the most to a liquid column of the height of the duct. The pressure may be regulated and it is advisable to carefully control it by a manometer which is connected to the mortar pipe, so that one can see how high the mortar stands in the flue. After some time the pressure in' the pipe is shut oil and the still liquid mortar runs out. In the meanwhile part of the mortar has penetrated into the joints that have to be repaired and has already set or solidifled to such extent that -it does not run back. The mortar may thus be injected several times at short intervals if a single injection is insufllcient to tighten the joints, It is also possible to clean the ducts afterwards with a brush or the like, in order to remove mortar particles that may have possibly stuck to the duct sides.

For the practice 01' the present invention, it

is very convenient to arrange the rich gassupply pipes underneath the oven brickwork in such a manner that the rich gas distribution main is connected to the vertical ducts in the oven brickwork through horizontal supply pipe branches communicating by means of vertical pipes with said vertical'ducts. In this case the vertical pipes may be extended across their points of connection with the horizontal supply pipes and may each be provided at its end with a detachable plug. For carrying out the process according to the invention it is only necessary to unscrew this plug and to connect the vertical pipes to the mortar vessel, say by means of an armoured pipe or some other arrangement.

A further great advantage of the invention is its availability for use with any type of underburner oven without the least alteration or interruption in the working of the plant.

The accompanying drawing illustrates a regenerative coke oven 01 the underburner type having its rich gas supply pipes arranged as described above for theconvenient practice of the invention.

of the drawing:

Fig. l is a vertical longitudinal section through a portion of a coke oven heating wall taken on the line B-B of Fig. 2;

Fig. 2 is a vertical section of a portion of the oven taken on the line AA of Fig. 1;

Fig. 3 is a section taken on the line 3-3'of Fig. 4 showing gas supply pipe parts shown in smaller scale in Fig. 2, and a Fig. 4 is a view taken at right angles to Fig. 3 showing gas supply pipe parts shown on a smaller scale in Fig. 1.

The regenerative coke oven shown in the drawing comprises side by side coking chambers 1 alternatingalong the length 01' the coke oven battery with interposed heating walls 2, each heating wall '2 being formed with a longitudinal row of twin or hairpin flues, each twin or hairpin flue comprising one leg or individual flue portion 3 connected at its upper end to the upper end of a second leg or individual flue 3a. Two vertical rich gas supply ducts 4 and 4a open at their upper ends into the lower portion 01' each flue part 3 and have their lower ends connected to a corresponding horizontal distributing pipe 5. Similarly, two vertical rich gas supply ducts 6 and 6a open at their upper ends into the lower portion of each flue part 3a and have their lower ends connected to a corresponding horizontal distributing pipe 7. Regenerators 8 and. 9 for supplying preheated air or air and lean gas to the heating flues when the flow through the latter is in one direction, and receiving waste gas irom the heating flues when the flow is reversed, are arranged underneath the oven chambers 1 and the heating walls 2. The rich gas supply ducts 4, 4a, 6 and 60. lead upward to the corresponding flues through the separating walls 10 between the regenerators, and the lower portions of the pipe connections therefrom to the distributing pipes and 7, with the latter, are located, and are accessible in galleries 12 underneath the regeneratora, The ducts 4 and 40 leading to each flue part 3 open thereto at different levels, and the ducts 6 and 6a for, each flue part 3a. similarly open to the latter at different levels. Insofar as it has already been described the oven shown in the drawing is similar to the underburner coke oven shown in my prior Patent No. 1,770,285, granted July 8, 1930.

As is customary in underburner ovens the supply connections to thelower ends of theducts 4, 4a, 6 and 6a comprise vertical pipes 4'. 4a, 6'

' and 6a, respectively The upper end of each of the latter extends into the lower end of the corresponding duct, usually about to the level of the plane or contact 20 between the concrete foundation or substructure with the superposed oven brickwork. As shown best in Figs. 3 and 4, each of the vertical gassupply pipes 4' and 4a is connected to the corresponding distributing pipe 5 by a horizontal connection pipe 13, and each gas supply pipe 6' and 6a is connected by a horizontal connecting pipe 14 to the corresponding distributing pipe 5. lower ends of the pipes 4' and 4a extend below the level of the pipe connections 13, and the lower ends oi the pipes 6' and 6a extend below the lower ends of the connection pipes 14, and each of the pipes 4', 4a, 6' and 6a normally has its lower end closed by a corresponding'readfly removable plug or cap 15. v

The distribution pipes 5 and 'l are connected through individual cut-oi! valves 11 and 18, respectively, andthrough reversing valves 19, to a rich gas suppLv main 11 running longitudinally of the battery, there being an individual reversing valve-19 for each of the various pipes 5 and 7.

To introduce mortar into the rich gas ducts, 4, 4a, 6 and 6a. of a regenerator division wall in accordance with the present invention, to tighten or plaster crevices and joints in said walls it is only necessary to remove the corresponding plugs or caps 15 from the various supply pipes 4', 4a, 6' and 6a and then force the mortar into the lower ends of said pipes. To prevent the mortar thus supplied to the'vertical pipes from entering the corresponding horizontal distribut-.

, of the ducts 4, 4a, 6 and 6a should not exceed that required'to carry the column of mortar in of the mortar previously injected into each ver-. tical duct drains from the latter. The injection of the mortar into the vertical ducts may be repeated at short intervals when such repetition is found necessary. Mortar adhering on the walls of the vertical ducts 4, 4a, 6 and 6a, or in the pipes connected to their lower ends, to any objectionable extent may be removed easily by a mechanical cleaning action efltected with a brush or like cleaning device inserted through the pipe openings normally closed by the plugs or caps.

Ordinarily the joint plastering operation on an entire heating wall requires but a few minutes, and can easily be eflected during a single reversal period and is eifected without cooling the oven structure ordisturbing the pipe connections thereto except by the adjustment of the corresponding valves 17 and 18 and removal and replacement of the plugs or caps 15 and 16 and the insertion and removal of plugs in the horizontal pipe connections 13 and 15. Furthermore, as the mortar can be forced into the individual rich gas supply passages 4, 4a, 6 and 6a one at a'time, the I of the regenerator division wall, between any adjacent pair of ducts, is correspondingly small.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: i 4

i. In the operation of an underburner coke oven having heating fines and oven masonry beneath said hues and vertical ducts in said masonry for supplying gas to said flues, the method of tightening crevices and joints opening in said masonry into communication with one of said ducts which consists in forcing mortar under pressure into such duct and also from said duct into crevices and joints communicating with said duct, holding the mortar in the duct and in the crevices and joints for a time long enough to permit the mortar to set in the crevices and joints sumciently to insure its retention therein when the mortaris drained from the duct and short enough to prevent the adherence of a substantial amount of the mortar on the wall or the duct, and then draining the mortar from the duct.

2. In the operation of an underburner coke oven having heating hues and oven masonry beneath said flues and vertical ducts in said. masonry for supplying gas to said flues, the method of tightening crevices and joints opening in said masonry into communication with'one of said ducts which consistsin forcing mortar under pressureinto said duct and also from said duct into crevices and joints-communicating with said duct, holding the mortar in the duct for a time long enough to. permit the mortar to set in the crevices and joints sufliciently to insure its retention therein when the mortar is drained from the duct and short enough to prevent the adherence of a substantial amount of mortar on the wall of the duct, then draining the mortar from the duct, and thereafter removing mortar adhering to the duct by a mechanical cleaning action.

CARL OTTO. 

